Aug 24, 2013 #1 P Port Map Advanced Member level 4 Joined Aug 24, 2013 Messages 118 Helped 15 Reputation 30 Reaction score 14 Trophy points 1,298 Activity points 2,089 Hi. I want to pass a signal from a fast clock domain to slow clock domain but the timing analysis fails. I need no timing analysis for this path. How can I disable Timing analysis for these signals? Or how can disable Timing analysis for these domains? I'm using ISE 14.3.
Hi. I want to pass a signal from a fast clock domain to slow clock domain but the timing analysis fails. I need no timing analysis for this path. How can I disable Timing analysis for these signals? Or how can disable Timing analysis for these domains? I'm using ISE 14.3.
Aug 24, 2013 #2 mrflibble Advanced Member level 5 Joined Apr 19, 2010 Messages 2,720 Helped 679 Reputation 1,360 Reaction score 652 Trophy points 1,393 Activity points 19,551 Port Map said: How can I disable Timing analysis for these signals? Click to expand... Use a TIG contraint. You can read all about TIG constraints in this here document. Alternatively if you have more than a 1-bit signal, you may want to use a small fifo to go between clock domains.
Port Map said: How can I disable Timing analysis for these signals? Click to expand... Use a TIG contraint. You can read all about TIG constraints in this here document. Alternatively if you have more than a 1-bit signal, you may want to use a small fifo to go between clock domains.
Aug 25, 2013 #3 P Port Map Advanced Member level 4 Joined Aug 24, 2013 Messages 118 Helped 15 Reputation 30 Reaction score 14 Trophy points 1,298 Activity points 2,089 Very thanks to your helps. I use the TIG in UCF file like this: NET "sClock20M" TNM_NET =FFS sClock20M_GRP; NET "sClock200M" TNM_NET =FFS sClock200M_GRP; TIMESPEC TS_Example = FROM "sClock200M_GRP" TO "sClock20M_GRP" TIG;
Very thanks to your helps. I use the TIG in UCF file like this: NET "sClock20M" TNM_NET =FFS sClock20M_GRP; NET "sClock200M" TNM_NET =FFS sClock200M_GRP; TIMESPEC TS_Example = FROM "sClock200M_GRP" TO "sClock20M_GRP" TIG;
Aug 25, 2013 #4 mrflibble Advanced Member level 5 Joined Apr 19, 2010 Messages 2,720 Helped 679 Reputation 1,360 Reaction score 652 Trophy points 1,393 Activity points 19,551 That TIMESPEC seems to be okay.